JPH08107539A - Information recording and reproducing device - Google Patents

Abstract

PURPOSE: To confirm a recorded voice at the time of reserve reproduction or any other special reproduction by reproducing audio information from a main memory while changing the address for the unit of an audio block. CONSTITUTION: An audio block dividing means divides the audio information recorded in a main memory 13 into the audio blocks based on the level of the audio information, and a video block dividing means divides video information recorded in the main memory 13 into video blocks based on the audio blocks. Further, an audio signal processing circuit 16 reproduces the audio information from the main memory 13 while changing the address for the unit of the audio block, and a video signal processing circuit 19 reproduces the video information from the main memory 13 while changing the address for the unit of the video block. Therefore, each silent part of audio information is defined as one block, images and voices can be reversely transmitted in the direction of a time base while normally reproducing them for each block, and the recorded voice can be confirmed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an information recording / reproducing apparatus such as a video camera for photographing, recording and reproducing images.

[0002]

2. Description of the Related Art Conventionally, when recording a video signal and an audio signal, a VTR (video tape) which records an analog signal as it is by using a magnetic tape having a tape width of 1/2 inch or 8 mm as a recording medium. It was common to use a recorder).

A VTR of this type is formed on a magnetic tape wound on a rotary drum and sent by a capstan, and one track is formed by a rotary head provided on the rotary drum.
It is for recording / reproducing the video signal of the field.

When performing special reproduction, especially reverse reproduction in this VTR, the capstan is rotated in the reverse direction, the magnetic tape is fed in the direction opposite to that during recording, and the reproduction is performed while the rotary head traverses several tracks. Was there.

[0005]

However, in the reverse reproduction of the VTR, when the audio signal is recorded while being superposed on the video signal, it becomes discontinuous when the magnetic tape is sent in the reverse direction. If it becomes inaudible and the audio signal is recorded on the horizontal dedicated track on the magnetic tape, the reverse signal is completely reproduced and the sounding pitch is different from that at the time of recording, so check the recorded audio. There was a problem that I could not do it.

In view of the above conventional problems, it is an object of the present invention to provide an information recording / reproducing apparatus capable of confirming a recorded voice during reverse reproduction or other special reproduction.

[0007]

In order to achieve the above object, a first invention is an information recording / reproducing apparatus for recording and reproducing continuous video information and audio information in a solid memory, and recording the same in the solid memory. Audio block dividing means for dividing the audio information into audio blocks based on the level of the audio information, and video block dividing means for dividing the video information recorded in the solid-state storage body into video blocks based on the audio blocks. And audio information reproducing means for reproducing the audio information from the solid-state storage unit while changing the address in units of the audio block, and changing the address of the video information from the solid-state storage unit in the unit of video block. And a video information reproducing means for reproducing.

In the above-mentioned first invention, the voice information reproducing means is constituted so as to reproduce the voice information from the solid-state memory body while changing the address in the voice block unit in the opposite direction of the address. The video information reproducing means may be configured to reproduce the video information from the solid-state storage body in units of the video block while changing an address in a direction opposite to that at the time of storage.

In the above-mentioned first invention, the voice information reproducing means is constituted so as to reproduce the voice information from the solid-state memory body in units of the voice block while changing an address in the same direction as when storing the voice information. The video information reproducing means may be configured to reproduce the video information from the solid-state storage unit in units of the video block while changing the address in the same direction as when storing.

In order to achieve the above object, the second invention is
In an information recording / reproducing apparatus for recording and reproducing continuous video information and audio information in a solid-state memory, an audio block dividing means for dividing the audio information recorded in the solid-state memory into audio blocks based on the level of the audio information. And voice information reproducing means for reproducing the voice information from the solid-state storage unit while changing the address in the voice block unit,
Video information reproducing means for reproducing the video information from the solid-state storage medium while changing the address in field units.

In the above-mentioned second invention, the voice information reproducing means is constituted so as to reproduce the voice information from the solid-state memory body while changing the address in the voice block unit in a direction opposite to that at the time of storage. The video information reproducing means may be configured to reproduce the video information from the solid-state storage body while changing an address in a field unit in a direction opposite to that at the time of storage.

In the above-mentioned second invention, the voice information reproducing means is constituted so as to reproduce the voice information from the solid-state memory body in units of the voice block while changing an address in the same direction as when storing the voice information. The video information reproducing means may be configured to reproduce the video information from the solid-state storage body in units of fields while changing the address in the same direction as when storing.

[0013]

According to the first aspect of the present invention, the audio block dividing means divides the audio information recorded in the solid-state memory into audio blocks based on the level of the audio information, and the video block dividing means is the solid-state memory. The video information recorded in the memory is divided into video blocks based on the audio blocks.
Further, the audio information reproducing means reproduces the audio information from the solid-state memory while changing the address in the audio block unit, and the video information reproducing means changes the address of the video information from the solid-state memory in the image block unit. Play while playing. As a result, each silent part of audio information is treated as one block, and normal reproduction is performed for each block.
You can send video and audio in the opposite direction in the time axis direction,
It is possible to check the recorded voice during reverse playback and other special playback.

According to the second aspect of the invention, the audio block dividing means divides the audio information recorded in the solid-state memory into audio blocks based on the level of the audio information, and the audio information reproducing means operates from the solid-state memory. The audio information is reproduced while changing the address for each audio block, and the video information reproducing means reproduces the video information from the solid-state memory while changing the address for each field. With this, it is possible to easily and accurately set each silent portion of audio information as one block, and perform normal reproduction for each block, while transmitting video and audio in opposite directions in the time axis direction.

[0015]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing a schematic configuration of a memory video system according to an embodiment of an information recording / reproducing apparatus of the present invention.

The memory video system 1 has a video input terminal 2 for inputting a video signal and an audio input terminal 3 for inputting an audio signal. The video input terminal 2 has an A / D converter 4 and a video signal processing circuit. 5 and ID generation circuit 6
Are connected in sequence.

Here, the A / D converter 4 is an A / D converter capable of high-speed processing, and the video signal processing circuit 5 performs Y / C separation, color processing, etc. on the input video signal, The ID generation circuit 6 has a function of adding an ID such as a time code or an image quality mode to the video signal.

Further, the audio input terminal 3 has an A /
The D converter 7, the audio signal processing circuit 8 and the ID generating circuit 9 are sequentially connected, and the silence detecting circuit 10 is connected between the audio signal processing circuit 8 and the ID generating circuit 9. The audio signal processing circuit 8 performs various noise removal processing and dynamic range restriction processing on the input audio signal, and the silent portion detection circuit 10 has a function of detecting a silent portion of the audio signal. ID generation circuit 9
Has a function of adding an ID indicating the signal of the silent part detected by the silent part detection circuit 10 to the ID of the audio signal.

The memory video system 1 also has a system controller 11 for controlling the operation of the entire system such as switching of operations. A main memory 13 is connected to the system controller 11 via a memory controller 12.

The system controller 11 includes operation keys 1
An instruction such as recording / playback / search is input by 4, and the memory controller 12 is controlled in response to the instruction, and at the same time, information such as a time code indicating an operating condition and a recording / playback time is displayed on the display unit 15. . This timecode is
The time elapsed from the beginning of the recording medium or the video program, the cumulative time taken by the camera, etc., and the date of recording or the time taken by the camera, the hour, minute, second frame, etc. Further, the main memory 13 is controlled by the memory controller 12 such as writing / reading of memory addresses, video data and audio data.

On the output side of the main memory 13, an audio signal processing circuit 16 and a D / A converter 17 are sequentially connected, while a video signal processing circuit 19 and a D / A converter 20 are sequentially connected. Then, the D / A converter 17 outputs to the acoustic monitor 22 via the output terminal 18,
Further, the D / A converter 20 is connected to the video monitor 23 via the output terminal 21, respectively. Further, on the output side of the main memory 13, a digital interface processing circuit (DI
F) 24 is connected, and its output side is connected to the output terminal 25.

The operations (A), (B), and (C) of this embodiment will be described.

(A) Recording operation When a recording operation is instructed by the operation keys 14, the video signal input from the video input terminal 2 is converted into an A / D converter 4
Is converted into a digital video signal. Then, in the video signal processing circuit 5, Y / C separation, color processing and the like are performed and the result is sent to the ID generating circuit 6. The ID generation circuit 6 adds an ID such as a time code or an image quality mode to the video signal while communicating with the system controller 11.

On the other hand, the audio signal input from the audio input terminal 3 is converted into a digital audio signal by the A / D converter 7. The audio signal processing circuit 8 subjects the digital audio signal to various types of noise removal, dynamic range limitation, and other processing, and is sent to the ID signal generation circuit 9 and the silent portion detection circuit 10. The silent part detection circuit 10 detects a silent part of the audio signal by a method described later, and adds an ID indicating the signal of the silent part to the ID of the audio signal by the ID generation circuit 9.

The IDs added by the ID generation circuits 6 and 9 are
The same digital code as the video and audio signals is added to each fixed amount of signal data. Normally, the video data is expressed in units of each field, so in the present embodiment, the ID is also added for each field. Although the audio has no unit, the unit is matched with the normal video in consideration of synchronization with the video, and handled for each field. The video and audio data to which the ID has been added is stored in the main memory 13.

Now, a method of detecting the silent portion of the silent portion detecting circuit 10 will be described with reference to FIGS. 2 (a) and 2 (b). The figure (a) is an analog waveform diagram of an audio signal, and the figure (b).
FIG. 3 is a configuration block diagram of a silent part detection circuit 10.

The portions P1 to P4 in FIG. 2 (a) represent silent portions, and this silent portion to the next silent portion is one block (α, β, γ in the figure). 2B, 31 is a level detection circuit, 32 is a comparison circuit, and 33 is a reference value generation circuit.

To detect the silent portion, the level detecting circuit 31 detects an absolute value or a square circuit from the input analog voice signal shown in FIG. 2A in the silent portion detecting circuit 10 shown in FIG. 2B. It is used to generate a DC component. This DC component is compared by the comparison circuit 32 with the reference value generation circuit 33.
If the DC component is small, the information indicating that there is a silent portion is sent to the ID generating circuit 9. In the ID generation circuit 9, the ID of the silent part is added to the data of the silent part and stored in the main memory 13.

Video and audio data are stored in the main memory 13 by such data processing, but it is also possible to add the main memory 13 or adopt a replaceable memory form such as an IC card.

When the recording stop is instructed by the operation key 14, the system controller 11 stops the recording in the main memory 13.

(B) Normal Reproducing Operation The reproducing operation will be described with reference to FIG.

When a reproducing operation is instructed by the operation keys 14, the system controller 11 gives an instruction to the memory controller 12 to read the recorded video and audio data from the main memory 13 in the order of recording. . Further, the audio signal processing circuit 16 and the video signal processing circuit 19 perform signal processing necessary for output such as emphasis, chroma encoding, and creation of composite signal, and the delay time required for reproduction signal processing using the above-mentioned ID signal. The deviation due to the above is corrected and synchronized, and the reproduced signals of the respective video and audio are respectively D / A converter 1
It is converted to an analog signal at 7 and 20 and output.

The user can confirm the reproduction output on the audio monitor 22 and the video monitor 23 connected to the audio output terminal 18 and the video output terminal 21, respectively. Further, since the video and audio data read from the main memory 13 are combined by the digital interface processing circuit 22 and output from the digital output terminal 23, it can be connected to other digital equipment.

(C) Reverse rotation operation When the operation key 14 is used to send an instruction for reverse reproduction, the system controller 11 searches only the ID of the audio data in the reverse direction and detects the first silent section ID, and then the memory The controller 12 is instructed to read the audio data and the video data synchronized with the audio data in field units from that address to the address where the search is started in the forward direction.

To read data, a silent part ID is detected and the address from that address to the address where the silent part ID is detected before is regarded as one block. While reading data in this block in the forward direction, Memory controller 1 to repeat the block address in the reverse direction
Controlled by two.

An example of this reverse reproduction operation is shown in FIG.
This will be described with reference to (a) and FIGS. 3 (a) and 3 (b).

In FIG. 3A, the video signal is the main memory 13
FIG. 3B is a diagram showing a state in which the audio signal is stored in the main memory 13, and FIG. The video signal and the audio signal are shown in FIG.
It is assumed that the blocks are recorded in order from left to right in (a), and in the time axis direction from bottom to top in FIGS. 3 (a) and 3 (b) in the order of blocks α, β, and γ.

The memory controller 12 first reads the audio data of the γ block and the video data (first field to fourth field) synchronized with the audio data in the positive direction (time axis direction). Next, the operation of moving the address to the start address of the β block, reading (Z1, Z2 in the figure), and reading the α block is repeated.
This means that the entire data is read in the direction opposite to the time axis while being read in the same time axis direction as during recording inside the block.

The data read in this way is processed in the same manner as in the above-mentioned normal reproduction, and is output to the video monitor 23 and the sound monitor 22.

The present invention is not limited to the illustrated embodiment, and various modifications can be made. For example, there are the following modifications.

(1) In the above embodiment, the reverse playback speed is 1
Although it corresponds to double speed, the conventional VTR has a high speed reverse reproduction operation. In the case of performing high-speed reverse reproduction with the information recording / reproducing apparatus using the memory of the above embodiment, FIG.
In (a) and (b), first, γ of video and audio data
After the block is reproduced in the forward direction, the block between the blocks is skipped and the address is changed so that the block is moved to the α block. Similarly, in the fast forward playback in the forward direction, and in the fast forward playback operation in the VTR, the block may be skipped in the forward direction to change the address.

(2) In the above embodiment, the case where the audio and the video are reproduced in synchronization with each other has been described. However, in the special reproduction, the audio and the video may not be particularly synchronized. That is, in the case of video, reverse playback for each field may be viewed more comfortably, and therefore the video signal has the same address as in the above embodiment, with each field in FIG. 3A as one block. The voice signal is reproduced by changing the address for each block of each silent portion so that the content can be understood. Further, in the high speed reverse reproduction and the fast forward, the blocks may be skipped and reproduced similarly to the modification of (1).

(3) The above-mentioned embodiment and modification (1),
In (2), the voice block is formed for each silent portion, but even if there is no voice, it does not necessarily become a silent portion. In consideration of such a case, as shown in FIG. 4, an audio extraction circuit 41 such as a bandpass filter for extracting audio may be added to the input side of the level detection circuit 31 of the silence detection circuit. Good.

(4) Rather than forming a voice block for each silent portion, the user writes an ID for forming a block with the operation keys 14 or switches during recording, thereby performing free special reproduction. You can also

[0046]

As described in detail above, according to the first aspect of the invention, the audio block dividing means for dividing the audio information recorded in the solid-state memory into audio blocks based on the level of the audio information, Video block dividing means for dividing the video information recorded in the solid-state memory into video blocks based on the audio blocks, and audio information for reproducing the audio information from the solid-state memory by changing the address in units of the audio blocks. Since the reproduction means and the video information reproduction means for reproducing the video information from the solid-state storage body while changing the address in the video block unit are provided, each silent part of the audio information is regarded as one block, While performing normal playback each time, you can send video and audio in the opposite direction in the time axis direction, and record during reverse playback or other special playback. It becomes possible to confirm the voice that is.

According to the second aspect of the present invention, the audio block dividing means for dividing the audio information recorded in the solid-state memory into audio blocks based on the level of the audio information, and the audio information from the solid-state memory is described above. Since the audio information reproducing means for reproducing the address while changing the address for each audio block and the video information reproducing means for reproducing the video information from the solid-state memory while changing the address for each field are simple and accurate. In addition, it is possible to send video and audio in the opposite direction in the time axis direction while performing normal reproduction for each block with each silent portion of the audio information as one block.

[Brief description of drawings]

FIG. 1 is a block diagram showing a schematic configuration of a memory video system according to an embodiment of an information recording / reproducing apparatus of the present invention.

2 is a diagram illustrating a silent portion detection method of a silent portion detection circuit 10. FIG.

FIG. 3 is a diagram showing a data format of a main memory.

FIG. 4 is a diagram showing another configuration example of a silence detection circuit.

[Explanation of symbols]

 1 Memory Video System 4 A / D Converter 5 Video Signal Processing Circuit 6 ID Generation Circuit 7 A / D Converter 8 Audio Signal Processing Circuit 9 ID Generation Circuit 10 Silence Detection Circuit 11 System Controller 12 Memory Controller 13 Main Memory 14 Operation Keys 15 Display unit 16 Audio signal processing circuit 17 D / A converter 19 Video signal processing circuit 20 D / A converter 22 Acoustic monitor 23 Video monitor 24 Digital interface processing circuit (DIF)

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI Technical indication H04N 5/93

Claims (6)

[Claims] 1. An information recording / reproducing apparatus for recording and reproducing continuous video information and audio information in a solid-state storage body, wherein the audio information recorded in the solid-state storage body is divided into audio blocks based on a level of the audio information. Audio block dividing means, video block dividing means for dividing the video information recorded in the solid-state memory into video blocks based on the audio blocks, and the audio information from the solid-state storage in units of the audio blocks. Information recording characterized by comprising audio information reproducing means for reproducing while changing the address, and video information reproducing means for reproducing the video information from the solid-state storage body in units of the video block while changing the address. Playback device. 2. The audio information reproducing means is configured to reproduce the audio information from the solid-state storage body while changing an address in the audio block unit in a direction opposite to a direction in which the address is stored, and the video information reproducing means is 2. The information recording / reproducing apparatus according to claim 1, wherein the image information from the solid-state memory is reproduced in units of the image block while changing an address in a direction opposite to a direction in which the address is stored. 3. The audio information reproducing means is configured to reproduce the audio information from the solid-state memory body while changing the address in the same direction as that at the time of storage in units of the audio blocks, and the video information reproducing means comprises: 2. The information recording / reproducing apparatus according to claim 1, wherein the image information from the solid-state memory is reproduced in units of the image block while changing the address in the same direction as when storing. 4. An information recording / reproducing apparatus for recording and reproducing continuous video information and audio information in a solid-state storage body, wherein the audio information recorded in the solid-state storage body is divided into audio blocks based on a level of the audio information. Audio block dividing means, audio information reproducing means for reproducing the audio information from the solid-state memory while changing the address in the audio block unit, and the video information from the solid-state memory in field unit An information recording / reproducing apparatus comprising: a video information reproducing means for reproducing while changing. 5. The audio information reproducing means is configured to reproduce the audio information from the solid-state storage body while changing the address in the audio block unit in a direction opposite to that at the time of storing, and the video information reproducing means is 5. The information recording / reproducing apparatus according to claim 4, wherein the video information from the solid-state memory is reproduced while changing an address in a field unit in a direction opposite to a direction in which the address is stored. 6. The audio information reproducing means is configured to reproduce the audio information from the solid-state storage unit while changing the address in the same direction as that at the time of storing, in units of the audio blocks, and the video information reproducing means comprises: 5. The information recording / reproducing apparatus according to claim 4, wherein the video information from the solid-state memory is reproduced while changing an address in a field unit in the same direction as when storing the information.